Boulangerite
A variety of Minerals
What is Boulangerite?
Boulangerite is a sulfosalt mineral, lead antimony sulfide, formula Pb5Sb4S11. It was named in 1837 in honor of French mining engineer Charles Boulanger (1810–1849). It forms metallic grey orthorhombic crystals. Sometimes the crystals form a fine feathery mass which has been called plumosite. Boulangerite is used as a lead ore.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Boulangerite before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
Boulangerite Localities Map
See where Boulangerite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Lead grey
- Hardness (Mohs)
- 2.5 - 3
- Density
- 6.21 g/cm³
- Streak
- Brownish
Chemical Properties
- Chemical Formula
- Pb5Sb4S11
- Elements
- Pb, S, Sb
Also Known As
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Boulangerite FAQs
How do I identify Boulangerite?
Boulangerite can be identified by its hardness of 2.5 - 3 on the Mohs scale, Lead grey color. Look for these key characteristics when examining specimens.
What color is Boulangerite?
Boulangerite typically appears in Lead grey. Color can vary depending on impurities and formation conditions.
How hard is Boulangerite?
Boulangerite has a hardness of 2.5 - 3 on the Mohs scale. This makes it a soft mineral that can be scratched easily.
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